5228-DS07-R datasheet(79/100 Pages) BOARDCOM

79 / 100 page

Data Sheet

BCM5228

7/12/04

Broa d c om Co rp o r a t i o n

Document

5228-DS09-405-R

Auxiliary Status 3 Register (Shadow Register)

Page 67

APD Wake-Up Timer[3:0]. This counter determines how long the BCM5228 stays in wake-up mode before going to low

power mode. This value is specified in 40-millisecond increments from 0 to 600 milliseconds. A value of 0 forces the

BCM5228 to stay in low power mode indefinitely. In this case, the BCM5228 requires a hard reset to return to normal mode.

AUXILIARY STATUS 3 REGISTER (SHADOW REGISTER)

Noise[7:0]. The BCM5228 provides the current mean squared error value for noise when a valid link is established.

FIFO Consumption[3:0]. The BCM5228 indicates the number of nibbles of FIFO currently used.

Table 45: Auxiliary Status 3 Register (Shadow Register 28d, 1Ch)

BIt

Name

R/W

Description

Default

15:8

Noise [7:0]

R/O

Current mean square error value, valid only if link is established

00h

7:4

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

–

000h

3:0

FIFO Consumption [3:0]

R/O

Currently used number of nibbles in the receive FIFO

0000

Note: MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1.

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